package net.hvacapp.cmvrfforandroid.utils;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 *
 * @author user
 */
public class CrashHandler implements UncaughtExceptionHandler {
//    private static final Logger logger = LoggerFactory.getLogger(CrashHandler.class);

    // 系统默认的UncaughtException处理类
    private UncaughtExceptionHandler mDefaultHandler;
    // CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    // 程序的Context对象
    private Context mContext;
    // 用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<String, String>();

    // 用于格式化日期,作为日志文件名的一部分
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss", Locale.getDefault());

    private final String mailTo = "support@mirror-networks.com";

    /**
     * 保证只有一个CrashHandler实例
     */
    private CrashHandler() {
    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
     */
    public void init(Context context) {
        mContext = context;
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            // 如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
            }

            // 退出程序
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }

        final String crashReport = getCrashReport(mContext, ex);
        new Thread() {
            public void run() {
                Looper.prepare();
//                logger.error("LLK Error:{}", crashReport);
                Looper.loop();
            }
        }.start();
        return true;
    }

    /**
     * 保存异常信息到文件
     *
     * @param crashReport 异常报告
     * @return File
     */
    protected File saveCrashInfo2File(String crashReport) {
        String fileName = "crash-" + formatter.format(new Date()) + ".log";
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            try {
                File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "crash");
                if (!dir.exists())
                    dir.mkdir();
                File file = new File(dir, fileName);
                FileOutputStream fos = new FileOutputStream(file);
                fos.write(crashReport.toString().getBytes());
                fos.close();
                return file;
            } catch (Exception e) {
//                logger.info("an error occured while writing file...");
            }
        }
        return null;
    }

    /**
     * 获取APP崩溃异常报告
     *
     * @param ex
     * @return
     */
    private String getCrashReport(Context context, Throwable ex) {
        collectDeviceInfo(context);
        return collectException(ex);
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
//            logger.info("an error occured when collect package info");
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
            } catch (Exception e) {
//                logger.info("an error occured when collect crash info");
            }
        }
    }

    /**
     * 获取错误信息
     *
     * @param ex
     * @return
     */
    private String collectException(Throwable ex) {
//        logger.info("saveCrashInfo2File");

        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sb.append(result);

        return sb.toString();
    }

    /**
     * 下面是以附件形式发送邮件
     *
     * @param context
     * @param crashReport
     * @param file
     */
    private void sendMail(final Context context, final String crashReport, final File file) {
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        String[] tos = {mailTo};
        intent.putExtra(Intent.EXTRA_EMAIL, tos);

        intent.putExtra(Intent.EXTRA_SUBJECT, "Android客户端 - 错误报告");
        if (file != null) {
            intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
            intent.putExtra(Intent.EXTRA_TEXT, "请将此错误报告发送给我，以便我尽快修复此问题，谢谢合作！\n");
        } else {
            intent.putExtra(Intent.EXTRA_TEXT, "请将此错误报告发送给我，以便我尽快修复此问题，谢谢合作！\n" + crashReport);
        }
        intent.setType("text/plain");
        intent.setType("message/rfc882");
        Intent.createChooser(intent, "Choose Email Client");
        context.startActivity(intent);
    }

    /**
     * 以文字内容形式发送错误信息
     *
     * @param context
     * @param crashReport
     */
    private void sendMailText(final Context context, final String crashReport) {
        Intent intent = new Intent(Intent.ACTION_SENDTO);
        intent.setType("text/plain");
        intent.putExtra(Intent.EXTRA_SUBJECT, "Android客户端 - 错误报告");
        intent.putExtra(Intent.EXTRA_TEXT, crashReport);
        intent.setData(Uri.parse("mailto:way.ping.li@gmail.com"));
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
    }
}